Join Date: Dec 2009
Location: Fort Collins, CO
Mentioned: 3 Post(s)
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Two notes about the slight differences:
1) If you run the same tire size on ALL FOUR corners, then there will be no damage to the powertrain caused by different sized tires.
2) Running tires which do not match the original diameter of the factory tires will result in some speedometer and odometer error. As I think Bill implies above, some brands with slightly different sidewall profiles are so close in diameter to OEM that the difference is moot.
As a side note, it is typical for car speedometers read a couple of MPH slow, so if you have tires just *slightly* larger than OEM diameter, they may be pretty darn accurate on the speedo.
2008 BMW E91 328xi Sportwagon
2009 BMW E92 328ix Coupe
1983 280ZX Turbo